
function F1() {
    var valueA = 1;
    var valueB = 2;
    return valueA + valueB;
}
    function F2() {
    var valueA = 1;
    var valueB = 2;
    return
    valueA + valueB;
}
    alert( F1() ); //output: 3
    alert( F2() ); //ouput: undefined

